The processes for gasoline and diesel overlap significantly; what should be done?
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The medium size is small, with low load in the middle section
It’s salted up; clean the trays
If salt formation occurs, online tower washing is required.
The overlap of the components indicates that the separation efficiency of your vapor-liquid phase is poor; it is necessary to optimize the operation by controlling reflux, temperature, and tower pressure! The specific parameters should be determined through one’s own practical experience, as even for similar devices developed by the same design institute, there are still noticeable differences in actual operation!
How much does the overlap between gasoline and diesel components amount to? What is the dry point of gasoline? What is the initial boiling point of diesel, and what is the temperature at the 10% point?
Dry point 200, diesel initial boiling point 175
Many of the catalytic distillation column designs created by design institutes feature overlapping components; to reduce this overlap, it is necessary to establish a clear approach for adjustments while keeping operations ongoing, and to keep exploring and making adjustments. This is a long-term task that requires optimal optimization as much as possible. But even so, overlap is basically inevitable; I’ve seen several sets of devices whose actual boiling points overlap.
Based on the test results, adjust the top temperature to control the dry point of gasoline; meanwhile, use another parameter to control the distillation temperature of diesel. Conduct regular tests and analyze the results to make necessary adjustments. Additionally, salt formation at the top of the fractionation tower can also cause severe overlap between gasoline and diesel; in such cases, water washing for displacement is required, along with analytical testing to determine the chloride ion content. Another situation is that a high gas-phase load causes column flooding